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Critical

Security advisory

Type: advisorySources: OSVCVE: CVE-2018-21018

Mastodon before 2.6.3 mishandles timeouts of incompletely established sessions.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2018-21018
Confirmed fixed CVEs
Not specified
Updated in this feed
31 Oct 2026, 10:31 UTC · Revision 1

Source evidence

CVE-2018-21018

core-osv · Original source

Published 22 Sept 2019, 15:15 UTC

Mastodon before 2.6.3 mishandles timeouts of incompletely established sessions.

osv:CVE-2018-21018
Complete source record
{
  "id": "221b6068dcdd7c7c569830633cf4e1aad24c7a0df29785af5ef34537c6d9ad17",
  "url": "https://osv.dev/vulnerability/CVE-2018-21018",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2018-21018",
    "summary": "Mastodon before 2.6.3 mishandles timeouts of incompletely established sessions.",
    "evidence": "osv:CVE-2018-21018",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2018-21018",
      "aliases": [
        "CVE-2018-21018"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/mastodon/mastodon",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "a1216e631537b1fbf07f2c8724ac05e757800be6"
                },
                {
                  "fixed": "404dc97fb013b7f835df65dfc22d07f68e482e23"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.6.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "404dc97fb013b7f835df65dfc22d07f68e482e23"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v2.6.2"
                  },
                  {
                    "range": [
                      {
                        "fixed": "a1216e631537b1fbf07f2c8724ac05e757800be6"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v2.6.3"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.6.1",
            "v2.6.0",
            "v2.6.0rc4",
            "v2.6.0rc3",
            "v2.6.0rc2",
            "v2.6.0rc1",
            "v2.5.0",
            "v2.5.0rc2",
            "v2.5.0rc1",
            "v2.4.3",
            "v2.4.3rc3",
            "v2.4.3rc2",
            "v2.4.3rc1",
            "v2.4.2",
            "v2.4.2rc3",
            "v2.4.2rc2",
            "v2.4.2rc1",
            "v2.4.1",
            "v2.4.1rc4",
            "v2.4.1rc3",
            "v2.4.1rc2",
            "v2.4.1rc1",
            "v2.4.0",
            "v2.4.0rc5",
            "v2.4.0rc4",
            "v2.4.0rc3",
            "v2.4.0rc2",
            "v2.4.0rc1",
            "v2.3.2",
            "v2.3.2rc5",
            "v2.3.2rc4",
            "v2.3.2rc3",
            "v2.3.2rc2",
            "v2.3.2rc1",
            "v2.3.1",
            "v2.3.1rc3",
            "v2.3.1rc2",
            "v2.3.1rc1",
            "v2.3.0",
            "v2.3.0rc3",
            "v2.3.0rc2",
            "v2.3.0rc1",
            "v2.2.0",
            "v2.2.0rc2",
            "v2.2.0rc1",
            "v2.1.3",
            "v2.1.2",
            "v2.1.1",
            "v2.1.0",
            "v2.1.0rc6",
            "v2.1.0rc5",
            "v2.1.0rc4",
            "v2.1.0rc3",
            "v2.1.0rc2",
            "v2.1.0rc1",
            "v2.0.0",
            "v2.0.0rc4",
            "v2.0.0rc3",
            "v2.0.0rc2",
            "v2.0.0rc1",
            "v1.6.1",
            "v1.6.0",
            "v1.6.0rc5",
            "v1.6.0rc4",
            "v1.6.0rc3",
            "v1.6.0rc2",
            "v1.6.0rc1",
            "v1.5.1",
            "v1.5.0",
            "v1.5.0rc3",
            "v1.5.0rc2",
            "v1.5.0rc1",
            "v1.4.7",
            "v1.4.6",
            "v1.4.5",
            "v1.4.4",
            "v1.4.3",
            "v1.4.2",
            "v1.4.1",
            "v1.4rc6",
            "v1.4rc5",
            "v1.4rc4",
            "v1.4rc3",
            "v1.4rc2",
            "v1.4rc1",
            "v1.3.2",
            "v1.3.1",
            "v1.3",
            "v1.2.2",
            "v1.2.1",
            "v1.2",
            "v1.1.2",
            "v1.1.1",
            "v1.1",
            "v1.0",
            "v0.9.9",
            "v0.9",
            "v0.8",
            "v0.7",
            "v0.6",
            "v0.1.2",
            "v0.1.1",
            "v0.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-21018.json"
          }
        }
      ],
      "modified": "2026-10-20T10:50:31.581095793Z",
      "provider": "osv",
      "references": [
        "https://github.com/tootsuite/mastodon/releases/tag/v2.6.2",
        "https://github.com/tootsuite/mastodon/releases/tag/v2.6.3",
        "https://github.com/tootsuite/mastodon/pull/9329",
        "https://github.com/tootsuite/mastodon/pull/9381"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2018-21018",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 381797,
  "published_at": "2019-09-22T15:15:13.657+00:00"
}